Add isWritableFileEntry to the fileSystem API

content/public/browser/child_process_security_policy.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
 #define CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 83 matching lines @@
                                         const std::string& filesystem_id) = 0;
 
   // Grants the child process the capability to access URLs of the provided
   // scheme.
   virtual void GrantScheme(int child_id, const std::string& scheme) = 0;
 
   // Returns true iff read access has been granted to the file system with
   // |filesystem_id|.
   virtual bool CanReadFileSystem(int child_id,
                                  const std::string& filesystem_id) = 0;
+
+  // Returns true iff read and write access has been granted to the filesystem
+  // with |filesystem_id|.
+  virtual bool CanReadWriteFileSystem(int child_id,
+                                      const std::string& filesystem_id) = 0;
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CHILD_PROCESS_SECURITY_POLICY_H_